[Bug 220565] x11-servers/xorg-server: crashes VirtualBox, starting with r445076, also with r445323

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220565

            Bug ID: 220565
           Summary: x11-servers/xorg-server: crashes VirtualBox, starting
                    with r445076, also with r445323
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: la5lbtyi at aon.at
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Scenario:
- Latest Virtualbox running on FreeBSD 11 p8 host
- FreeBSD 11 p8 client (both i386 and amd64 affected)
- KDE installed in client, kdm4 used to start X
- X using vboxvideo driver

Result:
- Starting X in a VirtualBox VM instantly crashes the VM.
- I suspect change r445076, the same behavior persists with r445323

VirtualBox log file entries at the time of the crash:

00:32:48.976072 VBVA: InfoScreen: [0] @0,0 800x600, line 0x1fff8, BPP 32, flags
0x1
00:32:48.988325 VBVA: InfoScreen: [0] @0,0 800x600, line 0xc80, BPP 32, flags
0x1
00:32:48.988382 Display::handleDisplayResize: uScreenId=0
pvVRAM=000000081280a000 w=800 h=600 bpp=32 cbLine=0xC80 flags=0x1
00:32:48.988682 VNCServerImpl::VRDEResize to 800x600x32bpp
00:32:51.625182 VBVA: InfoScreen: [0] @0,0 800x600, line 0xc80, BPP 32, flags
0x1
00:32:51.625239 Display::handleDisplayResize: uScreenId=0
pvVRAM=000000081280a000 w=800 h=600 bpp=32 cbLine=0xC80 flags=0x1
00:32:51.625289 VNCServerImpl::VRDEResize to 800x600x32bpp

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